Author Topic: Reproduction 2 piece rotor review  (Read 3289 times)

Mike S

  • Hero Member
  • *****
  • Posts: 1912
    • View Profile
Re: Reproduction 2 piece rotor review
« Reply #30 on: May 18, 2017, 01:45:15 AM »
 When I get around to it I'll see about swapping the hubs that came with the rotors with the original ones. I'm sure (at least hoping) the bolt holes will line up.

Mike
67 LOS SS/RS L35 Hardtop - Original w/UOIT
67 NOR SS/RS L35 Convertible - Under restoration

x66 714

  • Member
  • ***
  • Posts: 461
    • View Profile
Re: Reproduction 2 piece rotor review
« Reply #31 on: May 18, 2017, 04:36:36 AM »
I'm glad you opened this discussion. It certainly has brought out some interesting point. I for one will be looking forward to your finds Mike. I need to get X66 714 back on all fours again but I'm not in so much of a hurry after reading some of the points here...Thank you, Joe
See America's First, Chevrolet

1968 Z/28 Corvette Bronze. Black Hounds Tooth. 02E Los Angeles born 3/13/1968 pnt OO. Purchased March 1976
1969 SS396 Yellow/Yellow 08E Norwood born 8/28/1969 pnt 76E. Purchased April 1981

Mike S

  • Hero Member
  • *****
  • Posts: 1912
    • View Profile
Re: Reproduction 2 piece rotor review
« Reply #32 on: May 18, 2017, 12:54:31 PM »
Hi Joe,

  I'll look at changing it this weekend. I'll closely compare the grain structures and even give it the "ping" check. I'll also weigh the two hubs to see if there is a difference.

Mike
67 LOS SS/RS L35 Hardtop - Original w/UOIT
67 NOR SS/RS L35 Convertible - Under restoration

Kelley W King

  • Hero Member
  • *****
  • Posts: 600
    • View Profile
Re: Reproduction 2 piece rotor review
« Reply #33 on: May 18, 2017, 09:26:41 PM »
Talk about going to school, Bergy is the bus driver.
69 Z28 RS Scuncio Hi Performance
69 SS L78
67 SS Chevelle
64 Corvette
66 GTO Tiger Gold
77 Trans Am Special Edition

JKZ27

  • Member
  • ***
  • Posts: 471
    • View Profile
Re: Reproduction 2 piece rotor review
« Reply #34 on: May 23, 2017, 06:14:49 AM »
Great read, Bergy! Thanks.
John
69 RS/SS Cortez Silver, L48 MC1
68 RS Ash/Ivy Gold 327EFI M20

Mike S

  • Hero Member
  • *****
  • Posts: 1912
    • View Profile
Re: Reproduction 2 piece rotor review
« Reply #35 on: May 25, 2017, 01:12:40 AM »
 I verified that the original hubs can be mounted on the reproduction rotors.
The original hub fit snug into the reproduction rotor (as well as the reproduction hub) so they are obviously machined the same.
I held both hubs (minus the rotors) by a lug nut and gave it the 'ping' test but they sounded exactly the same.
The hub/rotor bolt holes lined up exactly so I left the original hub mounted on the reproduction rotor and assembled the brakes.


Mike
67 LOS SS/RS L35 Hardtop - Original w/UOIT
67 NOR SS/RS L35 Convertible - Under restoration

x66 714

  • Member
  • ***
  • Posts: 461
    • View Profile
Re: Reproduction 2 piece rotor review
« Reply #36 on: May 25, 2017, 02:30:54 AM »
Thanks for checking that. I left an e-mail for my friend Hal Baer (Baer Brakes) to see if he would make a run of rotors only. I'm waiting for his response. If not I'll order the cheap rotor assm & use my hubs. Thank you, Joe
See America's First, Chevrolet

1968 Z/28 Corvette Bronze. Black Hounds Tooth. 02E Los Angeles born 3/13/1968 pnt OO. Purchased March 1976
1969 SS396 Yellow/Yellow 08E Norwood born 8/28/1969 pnt 76E. Purchased April 1981

bergy

  • Member
  • ***
  • Posts: 153
    • View Profile
Re: Reproduction 2 piece rotor review
« Reply #37 on: May 25, 2017, 09:38:10 AM »
If one is made out of cast and the other is ductile, those hubs shouldn't sound the same on the "ring" test Mike.  Did the ring like a bell, or just have a dull thud?

ZLP955

  • Hero Member
  • *****
  • Posts: 1248
    • View Profile
Re: Reproduction 2 piece rotor review
« Reply #38 on: May 25, 2017, 10:10:39 AM »
Good to know they fit! Did you re-use the original SAE, or the new metric bolts to mount the repro rotor on the original hub? Just wondered if the bolts are the same length.
Tim - 04A VN '69 z/28 69-69 715 ex-E/MP

Mike S

  • Hero Member
  • *****
  • Posts: 1912
    • View Profile
Re: Reproduction 2 piece rotor review
« Reply #39 on: May 25, 2017, 12:55:57 PM »
Hi Tim,

  The bolts are the same length but the threads don't match so I reused the original SAE grade 8 bolts.

Mike
67 LOS SS/RS L35 Hardtop - Original w/UOIT
67 NOR SS/RS L35 Convertible - Under restoration

Mike S

  • Hero Member
  • *****
  • Posts: 1912
    • View Profile
Re: Reproduction 2 piece rotor review
« Reply #40 on: May 25, 2017, 12:59:21 PM »
If one is made out of cast and the other is ductile, those hubs shouldn't sound the same on the "ring" test Mike.  Did the ring like a bell, or just have a dull thud?
  I used a light weight hammer and tried on different parts and they had a dull thud. I could get a slight ring from the rotors though but I figured it was due to the circular shape that would allow some resonance.
  Based on your experience with metals, if you had the rotor in your possession would you be able to tell what type of iron it is made from?

Mike
67 LOS SS/RS L35 Hardtop - Original w/UOIT
67 NOR SS/RS L35 Convertible - Under restoration

bergy

  • Member
  • ***
  • Posts: 153
    • View Profile
Re: Reproduction 2 piece rotor review
« Reply #41 on: May 25, 2017, 02:11:37 PM »
we had the unmachined hubs traveling down a belt conveyor at the foundry.  Hitting a ductile hub versus a cast iron hub yields a dramatic difference in "ring".  We always cast a gray cast iron "test" hub & painted it fluorescent orange so that it wouldn't get mixed up with the ductile hubs.  The test hub had to fail both the ring test and the ultrasonic test.  it's the wheel hub that you should be ringing, nut the rotor itself. 

Mike S

  • Hero Member
  • *****
  • Posts: 1912
    • View Profile
Re: Reproduction 2 piece rotor review
« Reply #42 on: May 25, 2017, 04:03:23 PM »
 No 'rings' on the hubs and I've tried holding it by only one stud so as to minimize the possibility of absorbing any sounds.
Hmmmm.....maybe these hubs are not gray iron (aside from having a gray hue to it)?

Mike
67 LOS SS/RS L35 Hardtop - Original w/UOIT
67 NOR SS/RS L35 Convertible - Under restoration